CN115852281A - Heating process for GH4720Li alloy - Google Patents
Heating process for GH4720Li alloy Download PDFInfo
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- CN115852281A CN115852281A CN202211597771.4A CN202211597771A CN115852281A CN 115852281 A CN115852281 A CN 115852281A CN 202211597771 A CN202211597771 A CN 202211597771A CN 115852281 A CN115852281 A CN 115852281A
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- 239000000956 alloy Substances 0.000 title claims abstract description 157
- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 157
- 238000010438 heat treatment Methods 0.000 title claims abstract description 135
- 238000005242 forging Methods 0.000 claims abstract description 86
- 238000003825 pressing Methods 0.000 claims abstract description 9
- 239000013078 crystal Substances 0.000 abstract description 22
- 238000013021 overheating Methods 0.000 abstract description 9
- 238000000034 method Methods 0.000 abstract description 7
- 238000004321 preservation Methods 0.000 description 18
- 238000005336 cracking Methods 0.000 description 12
- 230000035882 stress Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000008646 thermal stress Effects 0.000 description 3
- 101000912561 Bos taurus Fibrinogen gamma-B chain Proteins 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 238000005496 tempering Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
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- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000010587 phase diagram Methods 0.000 description 1
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- 239000000243 solution Substances 0.000 description 1
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Abstract
The invention discloses a heating process for GH4720Li alloy, which comprises the following steps: heating the resistance furnace to 780-820 ℃ at a heating rate of 20-30 ℃/min; placing the GH4720Li alloy blank in a resistance furnace, and preserving the heat for 55-65 min at 780-820 ℃; heating to 880-920 ℃, keeping the temperature for 55-65 min at the heating rate of 3-4 ℃/min; heating to 980-1020 ℃, wherein the heating rate is 8-10 ℃/min; keeping the temperature for 15-25 min; continuously heating to 1140 ℃, wherein the heating rate is 12-15 ℃/min; keeping the temperature for 15-25 min; carrying out primary forging and pressing to obtain an intermediate forging piece; keeping the temperature of the intermediate forging at 1140 ℃ for 3-8 min; and performing secondary forging. The temperature rise process is simple, and the whole crystal grains and the gamma' phase of the forging piece are uniform and fine; the heating temperature is lower than that of the prior art, and the phenomenon of overburning and overheating can not be generated.
Description
Technical Field
The invention relates to the technical field of GH4720Li alloy heating. In particular to a heating process for GH4720Li alloy.
Background
The GH4720Li alloy is widely used in the field of aviation because of its high-temperature strength and service temperature. In general, it is considered that the precipitation of two main fine crystal structures, namely a primary gamma 'phase and a secondary gamma' phase, has an important influence on the mechanical properties of the GH4720Li alloy. Therefore, when a GH4720Li alloy is subjected to heat treatment, it is generally aimed at promoting precipitation of primary γ 'phase and intragranular secondary γ' phase around grain boundaries and refining crystal grains, while ensuring that the sample does not crack during forging. For this reason, patent document CN109504927B provides a GH4720Li heating method for promoting precipitation of primary γ 'phase and secondary γ' phase in the grain boundary and refining crystal grains: a gradient heating process is adopted between 800 ℃ and 1180 ℃, wherein: the heating rate is less than or equal to 1.5 ℃/min when the temperature is less than 1070 ℃, and the heating rate is less than or equal to 0.5 ℃/min when the temperature is greater than or equal to 1070 ℃;
the specific process of patent document CN109504927B is as follows:
(1) Heating GH4720Li alloy to 850 deg.C, heating at 1.2 deg.C/min, and keeping the temperature for 40min;
(2) Continuously heating the GH4720Li alloy to 900 ℃, wherein the heating rate is 1.5 ℃/min, and then preserving heat for 20min;
(3) Continuously heating the GH4720Li alloy to 950 ℃, wherein the heating rate is 1.5 ℃/min, and then preserving heat for 30min;
(4) Continuously heating the GH4720Li alloy to 1000 ℃, wherein the heating rate is 1.2 ℃/min, and then preserving heat for 40min;
(5) Continuously heating the GH4720Li alloy to 1070 ℃, keeping the temperature for 50min, wherein the heating rate is less than or equal to 1.4 ℃/min;
(6) Continuously heating the GH4720Li alloy to 1080 ℃, wherein the heating rate is 0.5 ℃/min, and then preserving heat for 10min;
(7) Continuously heating the GH4720Li alloy to 1090 ℃, wherein the heating rate is 0.5 ℃/min, and then preserving heat for 10min;
(8) Continuously heating the GH4720Li alloy to 1100 ℃, wherein the heating rate is 0.5 ℃/min, and then preserving heat for 10min;
(9) Continuously heating the GH4720Li alloy to 1110 ℃, wherein the heating rate is 0.5 ℃/min, and then preserving heat for 20min;
(10) Continuously heating the GH4720Li alloy to 1120 ℃, wherein the heating rate is 0.5 ℃/min, and then preserving heat for 20min;
(11) Continuously heating the GH4720Li alloy to 1130 ℃, wherein the heating rate is 0.5 ℃/min, and then preserving heat for 20min;
(12) Continuously heating the GH4720Li alloy to 1140 ℃, wherein the heating rate is 0.5 ℃/min, and then preserving heat for 20min;
(13) Continuously heating the GH4720Li alloy to 1150 ℃, wherein the heating rate is 0.5 ℃/min, and then preserving heat for 20min;
(14) Continuously heating the GH4720Li alloy to 1160 ℃, wherein the heating rate is 0.5 ℃/min, and then preserving the heat for 20min;
(15) Continuing to heat the GH4720Li alloy to 1170 ℃, keeping the temperature at the rate of 0.5 ℃/min, and then keeping the temperature for 20min;
(16) The GH4720Li alloy is continuously heated to 1180 ℃, the heating rate is 0.5 ℃/min, and then the temperature is kept for 30min.
In patent document CN109504927B, gradient heating, temperature rise rate optimization, temperature preservation temperature, temperature preservation steps and time preservation are adopted to promote precipitation of primary γ 'phase around crystal boundary and secondary γ' phase in crystal and refine crystal grains, so that cracking does not occur in forging.
However, the technical solution of patent document CN109504927B has the following drawbacks: the heating temperature is high, so that the phenomenon of overheating and overburning is easily caused, and the performance of the forge piece is influenced due to the excessively grown crystal grains; the heating time is too long, the gradient heating operation is complicated, and the cost is high; only the local structure of the forging is formed, and the overall structure condition is not clear. Therefore, a heating process for the GH4720Li alloy is needed to be designed, so that the primary gamma 'phase around the grain boundary and the secondary gamma' phase in the grain are promoted to be separated out, the crystal grains are refined, the defects can be avoided, and meanwhile, the phenomenon that a forging piece is easy to crack in the forging process is avoided.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to provide a heating process for a GH4720Li alloy, so as to solve the problems of overheating and overburning caused by overhigh heating temperature, overlong heating time and the like in the existing heating process, easy cracking in the forging process of a forge piece and the like.
In order to solve the technical problems, the invention provides the following technical scheme:
a heating process for GH4720Li alloy, comprising the steps of:
step (1), heating the resistance furnace from room temperature to 780-820 ℃, wherein the heating rate is 20-30 ℃/min;
placing the GH4720Li alloy blank in a resistance furnace, and preserving heat for 55-65 min at 780-820 ℃;
step (3), continuously heating the GH4720Li alloy blank to 880-920 ℃, wherein the heating rate is 3-4 ℃/min; then preserving the heat for 55-65 min;
continuously heating the GH4720Li alloy blank to 980-1020 ℃, wherein the heating rate is 8-10 ℃/min; then preserving the heat for 15-25 min;
transferring the GH4720Li alloy blank to a gas furnace, and continuously heating the GH4720Li alloy blank to 1140 ℃ at a heating rate of 12-15 ℃/min; then preserving the heat for 15-25 min;
step (6), forging and pressing the GH4720Li alloy blank for the first time, wherein the deformation is 45-55%, and obtaining a GH4720Li alloy intermediate forging;
placing the GH4720Li alloy intermediate forging back into the gas furnace, and continuously preserving heat at 1140 ℃ for 3-8 min;
and (8) carrying out secondary forging on the GH4720Li alloy intermediate forging until the deformation reaches 70-80%, and then completing heating of the GH4720Li alloy to obtain the GH4720Li alloy forging.
The heating process for the GH4720Li alloy comprises the step (1) of heating a resistance furnace from room temperature to 800 ℃ for 30min.
The heating process for the GH4720Li alloy comprises the step (2) of placing a GH4720Li alloy blank in a resistance furnace, and keeping the temperature at 800 ℃ for 60min.
The heating process for the GH4720Li alloy comprises the step (3) of continuously heating the GH4720Li alloy blank to 900 ℃ at the heating rate of 3.5 ℃/min; then the temperature is kept for 60min.
The heating process for the GH4720Li alloy comprises the step (4) of continuously heating the GH4720Li alloy blank to 1000 ℃ at a heating rate of 10 ℃/min; then the temperature is kept for 20min.
The heating process for the GH4720Li alloy comprises the steps of (5) transferring a GH4720Li alloy blank into a gas furnace, continuously heating the GH4720Li alloy blank to 1140 ℃, wherein the heating rate is 14 ℃/min; then the temperature is kept for 20min.
The heating process for the GH4720Li alloy comprises the step (6) of carrying out first forging and pressing on a GH4720Li alloy blank, wherein the deformation is 50%; obtaining the GH4720Li alloy intermediate forging.
The heating process for the GH4720Li alloy comprises the step (7) of putting the GH4720Li alloy intermediate forging piece back into a gas furnace, and keeping the temperature for 5min at 1140 ℃.
The heating process for the GH4720Li alloy comprises the step (8) of carrying out secondary forging on the GH4720Li alloy intermediate forging until the deformation of the GH4720Li alloy intermediate forging is 80%, thus obtaining the GH4720Li alloy forging.
The heating process for the GH4720Li alloy comprises the steps of (1) heating a resistance furnace from room temperature to 800 ℃ at a heating rate of 30 ℃/min; the slow heating rate can cause the consumption time of the production process to be too long, and the too fast heating rate can cause the actual temperature in the hearth and the heating rate not to be synchronous, thereby causing the uniformity of the temperature in the resistance furnace to be poor;
placing a GH4720Li alloy blank in a resistance furnace, and preserving heat for 60min at 800 ℃; the GH4720Li alloy blank is prevented from being changed from a toughness state to a brittleness state due to the low-temperature cold brittleness of the GH4720Li alloy blank in a relatively low-temperature environment; however, if the GH4720Li alloy blank is placed when the temperature of the hearth is too high, the temperature difference between the core part and the surface of the GH4720Li alloy blank is too large, so that large thermal stress occurs and deformation or cracking occurs; according to the invention, the GH4720Li alloy blank is placed into the hearth at 800 ℃, so that the phenomena of low-temperature cold brittleness, deformation and cracking can be effectively avoided; the GH4720Li alloy blank can be fully heated after the heat preservation is carried out for 60min, and if the heat preservation time is too long, overheating or overburning is easy to cause, crystal grains grow up, and the performance is reduced; if the heat preservation time is too short, the blank is heat-impervious, so that the GH4720Li alloy blank has overlarge stress and is difficult to deform;
step (3), continuing to heat the GH4720Li alloy blank to 900 ℃, wherein the heating rate is 3.5 ℃/min; then preserving the heat for 60min; during the temperature rise of 800-900 ℃, if the temperature rise rate is lower than 3.5 ℃/min, the average grain size can grow, and the time cost is too large due to too slow temperature rise; if the temperature rise rate is higher than 3.5 ℃/min, the temperature difference between the surface of the GH4720Li alloy blank and the core part is too large, and the temperature on the dial plate is not consistent with the actual temperature in the hearth; the main purpose of heat preservation at 900 ℃ is to ensure that the temperature of the surface and the core of the GH4720Li alloy blank is consistent with that of a dial plate and prevent the core from deforming and cracking due to the fact that the core does not reach the target temperature; if the holding time at 900 ℃ is too short, the temperature difference between the surface of the GH4720Li alloy blank and the core part can be caused, and the temperature is inconsistent with that of the dial plate; if the heat preservation time is too long, crystal grains grow, the overheating phenomenon occurs, and the performance of the GH4720Li alloy blank is reduced;
step (4), continuing to heat the GH4720Li alloy blank to 1000 ℃, wherein the heating rate is 10 ℃/min; then preserving the heat for 20min; heating rates below 10 ℃/min can cause the average grain size to grow, and too slow heating causes excessive time cost; the temperature rise rate is higher than 10 ℃/min, so that the temperature of the surface and the core part is inconsistent, precipitated phases cannot be fully dissolved, and the temperature on the dial plate is inconsistent with the actual temperature in the hearth; 1. the temperature is kept at 1000 ℃ to mainly ensure that the temperature of the surface of the workpiece and the temperature of the core part are consistent with that of the dial plate, so that the core part is prevented from deforming and cracking due to the fact that the core part does not reach the target temperature; the thermal conductivity of the GH4720Li alloy blank at 1000 ℃ is close to three times of the thermal conductivity of the initial heating temperature, so the required heat preservation time is shorter than that before 1000 ℃, if the heat preservation time at 1000 ℃ is too short, the temperature difference between the surface of the GH4720Li alloy blank and the core part can be caused, the temperature is inconsistent with that of a dial plate, the precipitated phase cannot be fully dissolved, and thermal stress is generated, so that the cracking is caused during final forging and pressing; the crystal grains grow up and overheat phenomenon occurs if the heat preservation time is too long, and the performance of the GH4720Li alloy blank is reduced;
transferring the GH4720Li alloy blank to a gas furnace, and continuously heating the GH4720Li alloy blank to 1140 ℃ at a heating rate of 14 ℃/min; then preserving the heat for 20min; a temperature rise rate lower than 14 ℃/min may cause the growth of average grain size, and too slow temperature rise causes excessive time cost; the temperature rise rate is higher than 14 ℃/min, so that the temperature of the surface of the GH4720Li alloy blank is inconsistent with that of the core part, and the temperature on the dial plate is inconsistent with the actual temperature in the hearth; the heat preservation is carried out for 20min at 1140 ℃ to ensure that the temperature of the surface of the GH4720Li alloy blank and the temperature of the core part are consistent with that of the dial plate and prevent the core part from not reaching the target temperature to cause deformation and cracking; if the initial forging temperature is lower than 1140 ℃, precipitated phases cannot be fully dissolved in a solid solution; the initial forging temperature is higher than 1140 ℃, and overheating and overburning phenomena can occur. If the holding time is too short at 1140 ℃, the temperature of the surface and the core of the GH4720Li alloy blank is inconsistent with the temperature of the dial plate, the precipitated phase cannot be fully dissolved, and thermal stress is generated, so that the cracking is caused during final forging and pressing; if the heat preservation time is too long, crystal grains grow, the overheating phenomenon occurs, and the performance of the GH4720Li alloy blank is reduced;
step (6), carrying out first forging and pressing on the GH4720Li alloy blank, wherein the deformation is 50%; obtaining a GH4720Li alloy intermediate forging; if the deformation of the first forging is less than 50%, the crystal grains cannot be fully crushed, and if the deformation is more than 50%, the stress is too large, so that the workpiece can crack;
step (7), placing the GH4720Li alloy intermediate forging back into a gas furnace, and continuously preserving heat for 5min at 1140 ℃; the purpose of the tempering and heat preservation for 5min is that the deformation temperature interval of the material is narrow, the temperature of a workpiece is reduced under the free forging environment and is reduced to be below the deformation temperature interval, the stress is overlarge, if the tempering and heat preservation are not carried out, the workpiece is easy to crack, if the heat preservation time is less than 5min, the workpiece cannot be sufficiently heated, and if the heat preservation time is more than 5min, crystal grains are easy to grow; the initial forging temperature is lower than 1140 ℃, and precipitated phases cannot be fully dissolved; the phenomena of overheating and overburning can occur when the initial forging temperature is higher than 1140 ℃; the heat preservation at 1140 ℃ for 5min can avoid the problems;
and (8) carrying out secondary forging on the GH4720Li alloy intermediate forging until the deformation of the GH4720Li alloy intermediate forging is 80%, thus obtaining the GH4720Li alloy forging. If the deformation after the second forging is less than 80 percent, the crystal grains cannot be fully refined, the performance cannot meet the use requirement, and if the deformation is more than 80 percent, the stress is too large, so that the edge of the workpiece can crack; if the workpiece is directly forged and pressed to the deformation of 80% at one time without returning and maintaining the temperature, the temperature of the surface of the workpiece is reduced too fast in a free forging environment, the temperature difference between the core part and the surface of the workpiece is large, and the stress is too large, so that the cracking phenomenon can occur.
The technical scheme of the invention achieves the following beneficial technical effects:
the GH4720Li alloy forging obtained by the heating process has uniform and fine whole crystal grains and gamma' phase, and the cracking phenomenon cannot occur in the forging process of the forging. The gradient heating process in the heating process is simple, the heating temperature is lower than that of the prior art, the phenomenon of overburning and overheating cannot occur, the tissue uniformity is good, and the performance is high; the heating process has short heating time and greatly reduced cost; the operation is simple, and the practicability is strong.
Drawings
FIG. 1 is a schematic gradient ramp-up for a heating process for GH4720Li alloy in an embodiment of the invention;
FIG. 2 is a pictorial view of a GH4720Li alloy forging produced in an embodiment of the present invention;
FIG. 3 is a sectional inspection dot diagram of a GH4720Li alloy forging prepared in an embodiment of the invention;
FIG. 4 is a metallographic view of the edge of a GH4720Li alloy forging produced according to an embodiment of the invention;
FIG. 5 is a core metallographic picture for a GH4720Li alloy forging produced according to an embodiment of the present invention;
FIG. 6 is a metallographic map of one quarter of the diameter of a GH4720Li alloy forging made in an embodiment of the invention;
FIG. 7 is a gamma' phase mirror scanning image of the edge of a GH4720Li alloy forging prepared in an embodiment of the invention;
FIG. 8 shows a gamma prime phase mirror scan of a core of a GH4720Li alloy forging made in accordance with an embodiment of the present invention;
FIG. 9 gamma prime galvano-mirror scan of one quarter of the diameter of a GH4720Li alloy forging made in an embodiment of the invention.
Detailed Description
As shown in fig. 1, the heating process for GH4720Li alloy of the present embodiment includes the following steps:
step (1), heating the resistance furnace from room temperature to 800 ℃ for 30min;
placing a GH4720Li alloy blank in a resistance furnace, and preserving heat for 60min at 800 ℃;
step (3), continuing to heat the GH4720Li alloy blank to 900 ℃, wherein the heating rate is 3.5 ℃/min; then preserving the heat for 60min;
step (4), continuing to heat the GH4720Li alloy blank to 1000 ℃, wherein the heating rate is 10 ℃/min; then preserving the heat for 20min;
transferring the GH4720Li alloy blank to a gas furnace, and continuously heating the GH4720Li alloy blank to 1140 ℃ at a heating rate of 14 ℃/min; then preserving the heat for 20min;
step (6), carrying out first forging and pressing on the GH4720Li alloy blank, wherein the deformation is 50%; obtaining a GH4720Li alloy intermediate forging;
step (7), placing the GH4720Li alloy intermediate forging back into the gas furnace, and continuously preserving heat for 5min at 1140 ℃;
and (8) carrying out secondary forging on the GH4720Li alloy intermediate forging until the deformation of the GH4720Li alloy intermediate forging is 80%, thus obtaining the GH4720Li alloy forging.
The material object diagram of the GH4720Li alloy forging prepared by the embodiment is shown in FIG. 2, and the GH4720Li alloy forging is detected according to the monitoring point shown in FIG. 3. FIGS. 4-6 are the metallographic diagrams of the sides, core and quarter diameter portions of the GH4720Li alloy forging produced in the present example; as can be seen by combining the figure 2, the surface of the forged piece prepared by the embodiment is uniform and smooth, and the phenomenon that the forged piece cracks due to nonuniform internal and external temperature distribution is effectively avoided. Under the secondary free forging hammer, the forging can bear 80% of large deformation without cracking. Under the condition of ensuring that the material is not damaged, the heating process can enable the deformation of the forge piece to reach 80%. As can be seen from the gold phase diagrams at the side part, the core part and one fourth of the diameter part of the alloy forging of figures 4 to 6, the crystal grains at all parts of the forging are fine and uniform, the average crystal grain size is below 10 mu m, and the twinning phenomenon occurs. The heating process enables the temperature inside and outside the forge piece to be distributed more uniformly, can effectively avoid the phenomenon of crystal grain growth caused by overhigh external temperature, and greatly improves the yield of the material.
FIGS. 7 to 9 are gamma prime mirror scans of the edge, core and quarter diameter portions, respectively, of a GH4720Li alloy forging made in this example; as can be seen from fig. 7 to 9, the primary γ 'phase and the secondary γ' phase of the forged piece at each position are uniformly distributed, the primary γ 'phase is mainly distributed on the grain boundary, and the secondary γ' phase is mainly distributed in the grain. A large amount of primary gamma' phases can effectively inhibit the bow of original crystal boundaries and the crystal boundary migration process of recrystallized grains, so that the grain sizes of all parts of the forging sample under the heating process are small, and the structure is stable.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications are possible which remain within the scope of the appended claims.
Claims (10)
1. A heating process for GH4720Li alloy is characterized by comprising the following steps:
step (1), heating the resistance furnace from room temperature to 780-820 ℃, wherein the heating rate is 20-30 ℃/min;
placing a GH4720Li alloy blank in a resistance furnace, and preserving heat for 55-65 min at 780-820 ℃;
step (3), continuously heating the GH4720Li alloy blank to 880-920 ℃, wherein the heating rate is 3-4 ℃/min; then preserving the heat for 55-65 min;
step (4), continuously heating the GH4720Li alloy blank to 980-1020 ℃ and the heating rate is 8-10 ℃/min; then preserving the heat for 15-25 min;
step (5), transferring the GH4720Li alloy blank into a gas furnace, continuously heating the GH4720Li alloy blank to 1140 ℃, wherein the heating rate is 12-15 ℃/min; then preserving the heat for 15-25 min;
step (6), carrying out first forging and pressing on the GH4720Li alloy blank, wherein the deformation is 45-55%, and obtaining a GH4720Li alloy intermediate forging;
placing the GH4720Li alloy intermediate forging back into the gas furnace, and continuously preserving heat at 1140 ℃ for 3-8 min;
and (8) carrying out secondary forging on the GH4720Li alloy intermediate forging until the deformation reaches 70-80%, and then completing heating of the GH4720Li alloy to obtain the GH4720Li alloy forging.
2. The heating process for GH4720Li alloy according to claim 1, wherein in step (1), the resistance furnace is heated from room temperature to 800 ℃ for 30min.
3. The heating process for the GH4720Li alloy of claim 1, wherein in step (2), the GH4720Li alloy billet is placed in a resistance furnace and held at 800 ℃ for 60min.
4. The heating process for the GH4720Li alloy of claim 1, wherein step (3), continuing to heat the GH4720Li alloy billet to 900 ℃, the ramp rate is 3.5 ℃/min; then the temperature is kept for 60min.
5. The heating process for the GH4720Li alloy of claim 1, wherein step (4), continuing to heat the GH4720Li alloy billet to 1000 ℃, the ramp rate is 10 ℃/min; then the temperature is kept for 20min.
6. The heating process for the GH4720Li alloy of claim 1, wherein step (5), transferring the GH4720Li alloy billet into a gas furnace, continues heating the GH4720Li alloy billet to 1140 ℃, at a ramp rate of 14 ℃/min; then the temperature is kept for 20min.
7. The heating process for the GH4720Li alloy of claim 1, wherein in step (6), the GH4720Li alloy billet is subjected to a first forging with a deformation of 50%; obtaining the GH4720Li alloy intermediate forging.
8. The heating process for the GH4720Li alloy of claim 1, wherein step (7), placing the GH4720Li alloy intermediate forging back into the gas furnace, and continuing to hold at 1140 ℃ for 5min.
9. The heating process for the GH4720Li alloy of claim 1, wherein the GH4720Li alloy forging of step (8) is forged a second time to a deformation of 80% to obtain the GH4720Li alloy forging.
10. The heating process for GH4720Li alloy according to claim 1, wherein in step (1), the resistance furnace is heated from room temperature to 800 ℃ for 30min;
step (2), placing the GH4720Li alloy blank in a resistance furnace, and preserving heat for 60min at 800 ℃;
step (3), continuing to heat the GH4720Li alloy blank to 900 ℃, wherein the heating rate is 3.5 ℃/min; then preserving the heat for 60min;
step (4), continuing to heat the GH4720Li alloy blank to 1000 ℃, wherein the heating rate is 10 ℃/min; then preserving the heat for 20min;
transferring the GH4720Li alloy blank to a gas furnace, and continuously heating the GH4720Li alloy blank to 1140 ℃ at a heating rate of 14 ℃/min; then preserving the heat for 20min;
step (6), carrying out first forging and pressing on the GH4720Li alloy blank, wherein the deformation is 50%; obtaining a GH4720Li alloy intermediate forging;
step (7), placing the GH4720Li alloy intermediate forging back into the gas furnace, and continuously preserving heat for 5min at 1140 ℃;
and (8) carrying out secondary forging on the GH4720Li alloy intermediate forging until the deformation of the GH4720Li alloy intermediate forging is 80%, thus obtaining the GH4720Li alloy forging.
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| CN109504927A (en) * | 2018-12-17 | 2019-03-22 | 内蒙古工业大学 | A γ ' phase is precipitated and refines the GH4720Li heating means of crystal grain with transgranular secondary γ ' phase around promotion crystal boundary |
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| CN112893722A (en) * | 2021-01-15 | 2021-06-04 | 中国第二重型机械集团德阳万航模锻有限责任公司 | Rapid forming method for GH4720Li high-temperature alloy forging |
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| CN113604760A (en) * | 2021-07-14 | 2021-11-05 | 北京科技大学 | Method for improving strength stability of GH4738 alloy forging subjected to sub-solid solution treatment |
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